我不能让我的我的DropDownList火的的SelectedIndexChanged。我有以下几点:
I cannot get my SelectedIndexChanged of my dropdownlist to fire. I have the following:
<form id="form1" runat="server">
<div>
<asp:GridView id="grdPoll" runat="server" AutoGenerateColumns="false">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:DropDownList ID="DropDownList1" runat="server"
AutoPostBack="true"
OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
<asp:ListItem Text="Review" Value="Review" Selected="True">Review</asp:ListItem>
<asp:ListItem Text="Level1" Value="lvl1">Send Back to Level1</asp:ListItem>
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<asp:Label ID="lblCity" runat="server" Text="Label"></asp:Label>
</div>
</form>
在我的code后面我有这样的:
In my code behind I have this:
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
this.lblCity.Text = ((DropDownList)sender).SelectedValue;
}
如果我把这个相同的DDL以外的GridView的,它将触发。
If I put this same ddl outside of the gridview, it fires.
在回发发生,将AutoPostBack设置为true。本次活动只是永远不会触发。为什么我不能让我的事件在GridView内火?
The postback is occurring and the autopostback is set to true. The event just never fires. Why can't I get my event to fire from within the gridview?
感谢你。
嗯,这个问题被问个多月前,现在可能无关紧要,但@LFSR还跟最近编辑它,它在活动的问题。
Well, this question was asked more than a month ago and may be irrelevant now, but @LFSR was kind enough to edit it recently, it's in the "Active questions" list.
由于它仍然悬而未决(!224的观点),我想我应该给它一个去:
Since it remains unanswered (224 views!), I thought I should give it a go:
的问题是,在一个GridView的上下文中,将DropDownList(以下称为DDL)的动态控制,因此,其事件需要时回发到重新附加
The problem is that in the context of a GridView, the DropDownList(referred to hereafter as DDL) is a dynamic control and therefore its events need to be reattached upon Postback.
在这个概念的理解,解决方案变得相对简单:
When this concept is understood, the solution becomes relatively simple :
ASPX:
<asp:DropDownList ID="DDL1" runat="server" AutoPostBack="true" OnSelectedIndexChanged="DDL1_SelectedIndexChanged">
<asp:ListItem Text="Review" Value="Review" Selected="True">Review</asp:ListItem>
<asp:ListItem Text="Level1" Value="lvl1">Send Back to Level1</asp:ListItem>
</asp:DropDownList>
CS code:
CS Code:
protected void Page_Load(object sender, EventArgs e)
{
if(!Page.IsPostBack)
{
// Bind the GridView to something.
DataBindGrid();
}
}
protected void DDL1_SelectedIndexChanged(object sender, EventArgs e)
{
this.lblCity.Text = ((DropDownList)sender).SelectedValue;
}
protected void grdPoll_RowDataBound(object sender, GridViewRowEventArgs e)
{
if(Page.IsPostBack)
{
if(e.Row.RowType == DataControlRowType.DataRow)
{
DropDownList ddl = e.Row.FindControl("DDL1") as DropDownList;
if(ddl != null)
{
ddl.SelectedIndexChanged += new EventHandler(DDL1_SelectedIndexChanged);
}
}
}
}